(Fwd) Re: DOSFS bug fixes, IDE drivers and sample released

[Thomas Doerfler]

Hello Angelo,

the "sample" program is located in the patch filed in the gnat 
system as PR369. So if you go to 

http://www.oarcorp.com/cgi-bin/gnatsweb.pl

and inspect PR369 and download/apply the patch and then look 
into c/src/tests/samples/fileio, you will see the sample 
application.

BTW, you will also need PR368 and PR367 to get everything 
running (these PRs contain modifications for the DOSFS code 
and added drivers for PC386 and MBX8xx).

wkr,
	Thomas.


> Where are the samples for these? I want to test this out for pc386. Does 
> it support pc386 yet?
> 
> Eugeny S. Mints wrote:
> 
> >On Mon, 3 Mar 2003, Thomas Doerfler wrote:
> >
> >>------- Forwarded message follows -------
> >>From:           	"Thomas Doerfler" <Thomas.Doerfler at imd-systems.de>
> >>Organization:   	IMD
> >>To:             	Chris Caudle <chris at chriscaudle.org>
> >>Date sent:      	Mon, 03 Mar 2003 09:01:38 +0100
> >>Subject:        	Re: DOSFS bug fixes, IDE drivers and sample released
> >>Copies to:      	Thomas Doerfler <Thomas.Doerfler at imd-systems.de>
> >>Priority:       	normal
> >>
> >>
> >>
> >>>On Sunday 02 March 2003 9:48 am, Joel Sherrill wrote:
> >>>
> >>>>>filed as PR 367/368/369 in the GNATS system, see:
> >>>>>
> >>>Does the driver filed in PR 368 support DMA transfer yet, or programmed I/O
> >>>only?
> >>>
> >>It is really a minimal implementation, supporting PIO mode.
> >>Actually I am not so aware about various IDE transfer modes,
> >>the integration of DMA into the PC architecture an so on, my
> >>goal was to implement at least basic harddisc support.
> >>
> >
> >Actually the answer is the following: DMA and POI modes are
> >entities which belong to generic high level ATA driver
> >implemented in ata.c file. In other words wether the data
> >will be transferred in PIO or DMA mode depends on ATA
> >commands issued. In general, low level IDE drivers (as
> >Thomas drivers written for i386 and mbx8xx) just "pass" ATA commands to an
> >IDE chip just by providing ability for writing any data to a
> >chip registers. In addition to the basic
> >functionality described above, current IDE drivers have
> >several routines for optimization of data read/write in PIO
> >mode (*_ide_read_block/*pc386_ide_write_block).
> >
> >So, any low level IDE driver has ability to support PIO and
> >DMA modes by definition (but of course current low IDE
> >drivers may need some update for DMA support) and the issue
> >depends on generic ATA driver implementaion. Unfortunately, current ATA
> >driver implementation supports only PIO mode, but from the
> >beggining was designed to allow easy extension (I
> >mean addition of new ATA commands). So, generic ATA driver
> >should be modified for DMA mode support.
> >
> >>So here is a lot of space to improve things :-)
> >>
> >
> >Agree:)))
> >
> >Hope, this helps,
> >                        Eugeny
> >
> >
> 
> -- 
> Angelo Fraietta
> 
> PO Box 859
> Hamilton NSW 2303
> 
> Home Page
> 
> 
> http://www.users.bigpond.com/angelo_f/
> 
> There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
> There are those who seek knowledge to be known by others - that is VANITY
> There are those who seek knowledge in order to serve - that is LOVE
>     Bernard of Clairvaux (1090 - 1153)
> 
> 
> 

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